Beta1 tarball includes invalid path

[mwpowellhtx@…]

I tried downloading this a couple of times to verify. There appears to be an invalid path, something like "/path/to/boost" in the archive. If you open it in a Windows system using 7-zip, for instance, you'll find a top-level folder "" followed by Sources, or something like that. The tar.bz2, which is probably preferred if only because it is more compact, does not have the same problem. Nor does the 7z, which is preferred also due to size.